RS.eval wait=FALSE and ignore collection

[jangorecki]

Considering the case when I need to call a function on server side without fetching the results I can use RS.eval(..., wait=FALSE). But after that I cannot run another calls due to:

Error in RS.eval(rsc, x, wait = wait, lazy = lazy) : 
  uncollected result from previous command, remove first

Can I ignore collection and proceed with next call somehow?

[s-u]

No, because R is not threaded, so you can only run one R command at a given time, so you have to wait until the evaluation finished before submitting the next command. It's not as much about collection (you can always return NULL) but rather synchronization of the worker R.

You could add a queue on the client side if you wanted to enqueue commands until the R on the other side is ready to accept them - that's pretty much all you can do.